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| 钙含量和烧结时间对铬酸镧材料的显微组织及导电性的影响 | |
| 引用本文： | 付贵福,李胜利,孙良成,朱新德,李德辉,敖青.钙含量和烧结时间对铬酸镧材料的显微组织及导电性的影响[J].金属热处理,2003,28(12):8-12. |
| 作者姓名： | 付贵福 李胜利 孙良成 朱新德 李德辉 敖青 |
| 作者单位： | 1. 山东大学材料科学与工程学院,山东济南,250061 2. 山东大学材料科学与工程学院,山东济南,250061;包头稀土研究院,内蒙古包头,014010 3. 包头稀土研究院,内蒙古包头,014010 |
| 基金项目： | 国家“十五”、“86 3”(2 0 0 1AA32 70 10 )项目，山东省中青年科学家基金 (0 2BS0 6 1) |
| 摘 要： | 采用固相法制备了不同钙含量的铬酸镧试样。用扫描电镜分析了试样的微观组织，研究了钙含量及烧结时间对晶粒尺寸、收缩率及电阻率的影响。发现晶粒均为等轴晶，以台阶生长方式长大，随烧结时间的延长出现台阶退化现象。使用2000h后Lao.02 Cao.98 CrO3晶粒极为致密，气孔聚集在晶内及晶界。钙含量的摩尔分数从0．02到0．10变化时，试样收缩率明显增加，电阻率明显下降。随烧结时间的延长，试样的室温电阻率变化不大。 |
| 关 键 词： | 铬酸镧 LaCrO3 显微组织 电阻率 钙含量 烧结时间 导电性 |
| 文章编号： | 0254-6051(2003)12-0008-05 |
Influence of Ca Content and Sintering Time on Microstructure and Electrical Properties of LaCrO3 Materials |
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| FU Gui-fu,LI Sheng-li,SUN Liang-cheng.Influence of Ca Content and Sintering Time on Microstructure and Electrical Properties of LaCrO3 Materials[J].Heat Treatment of Metals,2003,28(12):8-12. | |
| Authors: | FU Gui-fu LI Sheng-li SUN Liang-cheng |
| Affiliation: | FU Gui-fu~1,LI Sheng-li~1,SUN Liang-cheng~ |
| Abstract: | The samples of LaCrO_3 with different Ca content were prepared by solid reaction method,and the microstructure was observed by SEM.The influence of Ca content and the sintering time of LaCrO_3 to the grain size,shrinkage ratio and electrical resistivity was studied.It was found that the LaCrO_3,grains composed of equiaxed grains,grow in stage which degenerates with increasing the time.The density of La_(0.02)Ca_(0.98)CrO_3 is very high being used for 2000h,and there are pores in grains and on grain boundary.With the Ca content increasing from 0.02 to 0.1,the shrinkage ratio of the sample increases and the electrical resistivity decreases obviously.With increasing the sintering time,the change of the electrical resistivity is not obvious. |
| Keywords: | lanthanum chromate(LaCrO_3) microstructure electrical resistivity |
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